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About this tool
Find how many months of uptime make a 1 or 3 year cloud reservation cheaper than paying the on-demand rate.
This calculator finds the break-even point of a cloud reservation: the number of months of real uptime at which a 1-year or 3-year commitment (upfront plus recurring rate over 730-hour months) becomes cheaper than paying the on-demand hourly price. It applies the same structure AWS Reserved Instances and Savings Plans, Azure Reservations and GCP Committed Use Discounts share, so engineers and FinOps teams can sanity-check a commitment before signing it.
Open Reserved Instance Break-Even Calculator on AltFTool — it loads instantly in your browser.
Enter the values you already know.
Fine-tune the options to match your scenario.
Read the result and use it in your planning or reporting.
Converts any reservation quote into break-even months and a minimum utilisation percentage.
Flags quotes where the reservation loses to on-demand even at 100% uptime.
Uses the upfront + recurring-rate structure common to AWS, Azure and GCP commitments.
Divide the total reservation cost (upfront payment plus the reserved hourly rate times 730 hours times the term months) by the monthly on-demand cost (on-demand hourly rate times 730). The result is the number of months of actual usage at which the reservation and on-demand spending are equal; fewer months of use than that means on-demand would have been cheaper.
Divide the break-even months by the term length. A typical 1-year reservation at a 40% discount breaks even at 60% utilisation — about 7.2 months of uptime out of 12 — so if the workload will run more than that, commit; if its future is uncertain beyond half the term, stay on demand.
730 is simply 8,760 hours in a year divided by 12, and AWS, Azure and GCP all quote monthly prices on that basis. Using a calendar month of 720 or 744 hours would change results by under 2%, but 730 keeps estimates consistent with every provider's own pricing calculator.
All-upfront gives the largest discount but concentrates risk: if the workload dies mid-term the money is spent, whereas no-upfront commitments still bill monthly but can sometimes be exchanged or resold (AWS convertible RIs and the RI marketplace). Compare the break-even months of each quote — a lower break-even means less utilisation risk — and remember this is a planning tool, not financial advice.
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